EmptyModifier.swift

//
//  EmptyModifier.swift
//  OpenSwiftUI
//
//  Audited for RELEASE_2021
//  Status: Blocked by PrimitiveSceneModifier

/// An empty, or identity, modifier, used during development to switch
/// modifiers at compile time.
///
/// Use the empty modifier to switch modifiers at compile time during
/// development. In the example below, in a debug build the ``Text``
/// view inside `ContentView` has a yellow background and a red border.
/// A non-debug build reflects the default system, or container supplied
/// appearance.
///
///     struct EmphasizedLayout: ViewModifier {
///         func body(content: Content) -> some View {
///             content
///                 .background(Color.yellow)
///                 .border(Color.red)
///         }
///     }
///
///     struct ContentView: View {
///         var body: some View {
///             Text("Hello, World!")
///                 .modifier(modifier)
///         }
///
///         var modifier: some ViewModifier {
///             #if DEBUG
///                 return EmphasizedLayout()
///             #else
///                 return EmptyModifier()
///             #endif
///         }
///     }
///
@frozen
public struct EmptyModifier: PrimitiveViewModifier/*, PrimitiveSceneModifier*/ {
    public static let identity = EmptyModifier()

    @inlinable
    public init() {}

    public static func _makeView(
        modifier: _GraphValue<Self>,
        inputs: _ViewInputs,
        body: @escaping (_Graph, _ViewInputs) -> _ViewOutputs
    ) -> _ViewOutputs {
        body(_Graph(), inputs)
    }
    
    public static func _makeViewList(
        modifier: _GraphValue<Self>,
        inputs: _ViewListInputs,
        body: @escaping (_Graph, _ViewListInputs) -> _ViewListOutputs
    ) -> _ViewListOutputs {
        body(_Graph(), inputs)
    }
    
    public static func _viewListCount(
        inputs: _ViewListCountInputs,
        body: (_ViewListCountInputs) -> Int?
    ) -> Int? {
        body(inputs)
    }
}